diff --git a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
index e626bec13..7cd1ecf69 100644
--- a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
+++ b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
@@ -17,7 +17,6 @@
 import java.util.IdentityHashMap;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.regex.Pattern;
 
@@ -113,7 +112,7 @@ public void destroy() {
 	}
 
 	private static Set<Object> newIdentitySet() {
-		final Map<Object, Object> m = new IdentityHashMap<>();
+		final IdentityHashMap<Object, Object> m = new IdentityHashMap<>();
 		return new AbstractSet<>() {
 
 			@Override